CVE-2026-74711

Kernel memory disclosure via PMBus type confusion

Published Aug 22, 2026 · Updated Aug 25, 2026

Type confusion in the Linux kernel PMBus driver allows attackers to disclose kernel memory or destabilize the system via a hardware alert. pmbus_notify() casts heterogeneous device attributes to sensor_device_attribute and reads an index beyond or across the actual object layout. Reachability requires PMBus SMBALERT IRQ handling and an onboard I2C/SMBus power device; no network-only path is exposed.

CVSS severity8.4
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in the Linux kernel PMBus driver allows attackers to disclose kernel memory or destabilize the system via a hardware alert. pmbus_notify() casts heterogeneous device attributes to sensor_device_attribute and reads an index beyond or across the actual object layout. Reachability requires PMBus SMBALERT IRQ handling and an onboard I2C/SMBus power device; no network-only path is exposed.

The record

CVE
CVE-2026-74711
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-843, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.4
  2. Affected versionversion=f469bde9afd136598a0c4edc054296e6046f90ee <0b121de89a99c54bcf516999b04e8531c84f08d5
  3. Affected versionversion=f469bde9afd136598a0c4edc054296e6046f90ee <59bd68ab05a8f9c9a60b6ec44682084184803ff4
  4. Affected versionversion=f469bde9afd136598a0c4edc054296e6046f90ee <821f6416e69782fa662aff94b5ea52c943042790

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=f469bde9afd136598a0c4edc054296e6046f90ee <0b121de89a99c54bcf516999b04e8531c84f08d5; version=f469bde9afd136598a0c4edc054296e6046f90ee <59bd68ab05a8f9c9a60b6ec44682084184803ff4; version=f469bde9afd136598a0c4edc054296e6046f90ee <821f6416e69782fa662aff94b5ea52c943042790

Published CVSS scores

2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
8.4Linux CVE teamCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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